/Engine/Plugins/FX/Niagara/Source/NiagaraEditor/Public/ViewModels/Stack/INiagaraStackItemGroupAddUtilities.h
Gets the add mode supported by these add group utilities.
[EAddMode](API\Plugins\NiagaraEditor\ViewModels\Stack\INiagaraStackItemGroupAddUtiliti-\EAddMode) GetAddMode() const